ASUS X453SA repair guide in PDF format, roughly 1.1 MB, filed with schematics. Guides of this kind usually describe the power-on sequence, main power rails, key test points and typical failure checks rather than reproducing the full circuit diagram. Expect it to help with methodical no-power or no-boot diagnosis on this notebook, ideally alongside a full schematic or boardview. Confirm the board revision on your unit, since the name does not state one.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @boardviews_schematics. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)